21225910680 has 160 divisors (see below), whose sum is σ = 76830692400. Its totient is φ = 5224829184.

The previous prime is 21225910649. The next prime is 21225910681. The reversal of 21225910680 is 8601952212.

21225910680 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 591 + 0 + 68 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21225910681) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 209850 + ... + 294089.

Almost surely, 2^21225910680 is an apocalyptic number.

21225910680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21225910680 is an abundant number, since it is smaller than the sum of its proper divisors (55604781720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21225910680 is a wasteful number, since it uses less digits than its factorization.

21225910680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503975 (or 503962 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The spelling of 21225910680 in words is "twenty-one billion, two hundred twenty-five million, nine hundred ten thousand, six hundred eighty".